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Are all emoji constructed with codepoints outside BMP as in with surrogate pairs? [closed]

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I am trying to learn more about emoji and how they are represented in Unicode. Somewhere I read that emojis are constructed with surrogate pairs, while I recently found '\u263A' which represents '☺'. I am just trying to understand if there is a specific rule with which all emojis are constructed or there can be any unicode value(inside or outside BMP) which may represent an emoji?
Also, it will be helpful if someone can point me to a JAVA API which identifies if a character represents an emoji or is part of an emoji representation(in case of surrogate pairs).

In java, is there a way to generate a valid dictionary word of certain length randomly? [closed]

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I need to generate a valid dictionary word of certain length but in a random fashion. Is there an api or code snippet that does this? I tried googling it but couldn't find anything for this.
Thanks

You can download this .csv file which has around 200 thousand English words.
You can then parse the .csv file, add the entries to an ArrayList. Then create a function that randomly generates a number between the available indices of the ArrayList and then use it to get an entry at that random index. Or, you can think of something alike yourself.

Linest function using java [closed]

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Is there any java third party library which can be used to implement Excel's LINEST function? I want to calculate LINEST value same as LINEST[known_y's;known_x's;cont;stats] function in Excel for an array of 'x' and 'y' values. Please let me know if anyone has an idea in implementing this.

Use ApacheCommons Math Library. There are specific SimpleRegression class.
Maybe help you!

From https://support.office.com/en-us/article/LINEST-function-84d7d0d9-6e50-4101-977a-fa7abf772b6d:
"The LINEST function calculates the statistics for a line by using the 'least squares' method to calculate a straight line that best fits your data" Looks like you just need to find an algorithm for for working out the least squares

Is there a Java SQL parser that supports the korean language? [closed]

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I have to parse SQL statements in Java. I'm trying to use zql and gsp (general sql parser) but they don't support the Korean language, triggering lexical exceptions.
Example statement:
select * from test where name = '한글왜안됨'
Can anyone suggest a solution or an alternative parser?

There is also the grammar part of JSQLParser. It's built with JavaCC so it should either handle all charsets or be very easily modified to do so.

Recently the fork of JSqlParser at https://github.com/JSQLParser/JSqlParser switched to UTF-8 parsing. There is already a section for special german letters. You could add like this korean language for identifiers. Quoted strings should already work for you without any change.
String sql ="select * from test where name = '한글왜안됨'";
Select select = (Select) CCJSqlParserUtil.parse(sql);
System.out.println(select.toString());
This code past my tests without any modifications using JSqlParser V0.8.8.

java binary message parsing [closed]

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Are there any good java libraries for parsing & dealing with proprietary messages in UDP size packets? The message is a simple byte array, where each byte(s) represents enums or text/ascii values.

You could also use a ByteBuffer to wrap your byte[]

Use DataInputStream to read the type of data you want if it fits the conversions (i.e. when reading an int check the endianess used by DataNIputStream matches your platform), wrapped around a ByteArrayInputStream directly fed by your byte array.